San Diego County, San Diego Rat Control Situation:
Hi David, Is a UV blacklight still useful, exterior-wise, if it rains after the rodents leave their urine stains? I am in the process of performing exterior maintenance to better exclude my roof rats. 1) I have a 25 year old cedar shake roof in San Diego California with openings under each shake along the rake edge of the roof at the gable ends of my house. There's no drip edge, i.e. under the shakes I have roofing paper (now somewhat curled) that runs more or less up to and rests right atop the fascia board. Because I have skip sheathing, and since the cross section of a shake is a wedge that is up to one inch at the upper, thick end, this appears to create many huge entry points along the rake edges even though the sheathing is rabbeted into the fascia board. As a result, I'm thinking of getting a UV blacklight to use outside the house to sleuth for urine stains along the upper edge of the gable end shakes and fascia boards. My question is, how easily does the winter rain wash away the urine, rendering this a pointless exercise? 2) I noticed a new product called "rat-out gel" and was thinking of applying it along the rake edges mentioned above. Or, maybe I should just buy many rolls of X-Clude and use that instead. Or maybe both. Any comment? Thanks very much for your website, Doug
My response: First off, I do not have experience using UV lights to detect rat urine. But I do suspect that rain will severely limit the effectiveness of this approach. I have never heard of Rat-Out Gel or XClude, but I typically stick to physical barriers rather than repellent type devices. If your roof makes this impossible, you might have a tough time keeping the rats out.
San Diego Rat Control Tip of The Week
Rats And Black Pepper
Rats eat almost anything. In their search for food, they can gnaw on plastic, wood, and even electrical wiring. A rat presence in your home can cause a lot of economic damage.
When this expense is added to the health problems rats' body fluids can cause, the best thing a person can do is getting them out of the house as soon as possible. The most common extermination way is using traps or rodenticides. However, there are more natural methods such as the use of peppers that cause unpleasant odors and tastes for the rodent and quickly drive them away.
Odors That Repel
Using repellents with unpleasant odors for rats is a way to keep them away from you in a friendly way. The advantage of not having to deal with the rodent's carcass can be worth the effort of constantly using these temporary methods. Rodents use their sense of smell to socialize as well as to survive. An odor such as ammonia often drives them away because it is very similar to the urine of large animals that could devour them. Spicy odors are perceived as dangerous chemicals that are also often avoided at all costs.
Black Pepper
Spicy food odors are unbearable for rats, thanks to their high capsaicin content. These natural compounds give the food its spicy effect, but they are also often very irritating to the mucous membranes and lungs of rodents. If ingested, they can cause a burning sensation in the taste buds and olfactory glands. Pepper is known to be able to scare away rats temporarily although this is not scientifically proven.
For all those people who are afraid of having to deal with poisons or homemade traps, finding new and less harmful options is a headache; however, homemade repellents like black pepper avoid harming other animals and humans, being a perfect choice. In any case, even if they are harmless odors, it is advisable to seek the advice and follow the instructions of a professional in the field.
